Proton Mail supports multiple accounts, but users must switch accounts each time they want to check another inbox. This makes managing multiple personal, business, or family accounts unnecessarily cumbersome.

Please add multi-account mailbox management similar to Apple Mail and other modern email clients. Users should be able to:
* View messages from all signed-in Proton accounts in a unified inbox.
* Open each account or mailbox separately when needed.
* See combined unread counts and notifications.
* Search across all connected accounts.
* Choose which accounts and folders appear in the unified view.
* Send and reply using the appropriate account automatically.

Standard IMAP support would also solve this by allowing users to manage Proton accounts in their preferred email client. However, because Proton does not provide conventional IMAP access, a native unified inbox is especially important.

This would make Proton Mail much more practical for anyone managing multiple accounts while preserving Proton’s encryption and security model.